A hybrid algorithm to solve optimal control problems is discussed in the present paper and applied to the powered descent guidance (PDG) problem. A reference solution is first obtained via a convex direct solver and is then used as guess for the primal–dual boundary-value problem associated with the initial problem. In this context, a covector mapping theorem is used to map the multipliers of the direct solution to the corresponding discrete costates of the indirect method. Collocation based on hp pseudospectral scheme is employed for the convex direct step, while single shooting is used for the indirect step. A switching-detection technique further equips the shooting. As opposed to the hybrid convex-indirect algorithm, a state-of-the-art purely indirect algorithm is outlined; such approach merges the same single shooting approach with a homotopic continuation. The proposed methods are applied to the pinpoint landing formulation of the PDG, framed in a three-dimensional environment. The results are finally outlined, comparing the proposed hybrid strategy to the purely indirect approach. The outcome highlights the gain in computational times for the hybrid optimization technique over the fully homotopic scheme, demonstrating the validity of the former for landing trajectory optimization purposes.
{"title":"Direct-Indirect Hybrid Strategy for Optimal Powered Descent and Landing","authors":"Fabio Spada, Marco Sagliano, F. Topputo","doi":"10.2514/6.2023-2502","DOIUrl":"https://doi.org/10.2514/6.2023-2502","url":null,"abstract":"A hybrid algorithm to solve optimal control problems is discussed in the present paper and applied to the powered descent guidance (PDG) problem. A reference solution is first obtained via a convex direct solver and is then used as guess for the primal–dual boundary-value problem associated with the initial problem. In this context, a covector mapping theorem is used to map the multipliers of the direct solution to the corresponding discrete costates of the indirect method. Collocation based on hp pseudospectral scheme is employed for the convex direct step, while single shooting is used for the indirect step. A switching-detection technique further equips the shooting. As opposed to the hybrid convex-indirect algorithm, a state-of-the-art purely indirect algorithm is outlined; such approach merges the same single shooting approach with a homotopic continuation. The proposed methods are applied to the pinpoint landing formulation of the PDG, framed in a three-dimensional environment. The results are finally outlined, comparing the proposed hybrid strategy to the purely indirect approach. The outcome highlights the gain in computational times for the hybrid optimization technique over the fully homotopic scheme, demonstrating the validity of the former for landing trajectory optimization purposes.","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117223978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Data fusion-based Incremental Nonlinear Model Following Control Design for a Hypersonic Waverider Configuration","authors":"Johannes Autenrieb","doi":"10.2514/6.2023-1997","DOIUrl":"https://doi.org/10.2514/6.2023-1997","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117228247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of Two Load Prediction Methods for Strain-Gage Balances","authors":"N. Ulbrich, T. Volden, Ross Flach","doi":"10.2514/6.2023-1934","DOIUrl":"https://doi.org/10.2514/6.2023-1934","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117268012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gust Load Alleviation Control and Gust Estimation for a High Aspect Ratio Wing Wind Tunnel Model","authors":"C. Forte, N. Nguyen, J. Xiong","doi":"10.2514/6.2023-0881","DOIUrl":"https://doi.org/10.2514/6.2023-0881","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"53 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Scaling Characteristics of Ground Vortices in a Nacelle Inlet Flow Field","authors":"D. A. Nichols, B. Vukasinovic, A. Glezer","doi":"10.2514/6.2023-1981","DOIUrl":"https://doi.org/10.2514/6.2023-1981","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"14 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120833609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Justin J. Matt, Haiyang Chao, Zhenghao Lin, Charlie Zheng
{"title":"Simplified Wake Vortex Encounter Modeling and Inner Loop Controller Analysis for Small UAS","authors":"Justin J. Matt, Haiyang Chao, Zhenghao Lin, Charlie Zheng","doi":"10.2514/6.2023-0801","DOIUrl":"https://doi.org/10.2514/6.2023-0801","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"45 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121016871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Crowther, M. Nabawy, Roland Penty Geraets, M. K. Quinn, Samuel Weigert, C. Warsop, M. Forster, Lucia Axani, Thomas R. Shearwood
{"title":"DARPA CRANE – A toolset for the design of compact fluidic distribution systems for flow control applications: Part 1 – Model development and system optimisation","authors":"B. Crowther, M. Nabawy, Roland Penty Geraets, M. K. Quinn, Samuel Weigert, C. Warsop, M. Forster, Lucia Axani, Thomas R. Shearwood","doi":"10.2514/6.2023-2311","DOIUrl":"https://doi.org/10.2514/6.2023-2311","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121094234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christian Klein, J. Lemarechal, U. Henne, S. Koch, V. Ondruš, A. Hensch, S. Schaber
{"title":"Temperature-Sensitive Paint measurements in combination with Carbon-Fiber-Reinforced Plastic models in cryogenic conditions","authors":"Christian Klein, J. Lemarechal, U. Henne, S. Koch, V. Ondruš, A. Hensch, S. Schaber","doi":"10.2514/6.2023-1460","DOIUrl":"https://doi.org/10.2514/6.2023-1460","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121252047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tyler Dean, Farha Y. Siddiqui, Mark Gragston, R. Bowersox
{"title":"Index of Refraction Fluctuation Spectra in Aerothermochemical Non-equilibrium Shock Layers","authors":"Tyler Dean, Farha Y. Siddiqui, Mark Gragston, R. Bowersox","doi":"10.2514/6.2023-0270","DOIUrl":"https://doi.org/10.2514/6.2023-0270","url":null,"abstract":"","PeriodicalId":125718,"journal":{"name":"AIAA SCITECH 2023 Forum","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121258436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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